text: In organophosphorus chemistry, an aminophosphine is a compound with the formula RP(NR) where R = H or an organic substituent, and n = 0, 1, 2.  At one extreme, the parent HPNH is lightly studied and fragile, but at the other extreme tris(dimethylamino)phosphine (P(NMe)) is commonly available.  Intermediate members are known, such as PhPN(H)Ph.  These compounds are typically colorless and reactive toward oxygen.  They have pyramidal geometry at phosphorus.